304 / X5CrNi18-10 vs 630 / 17-4PH: 62% composition overlap. Moderate differences, generally not direct substitutes.
304 / X5CrNi18-10 vs 630 / 17-4PH
Side-by-side chemical composition and mechanical property comparison.
Overview
304 / X5CrNi18-10
1.4301
The world's most widely used stainless steel — the original 18/8 austenitic. Good corrosion resistance in atmospheric, organic, and inorganic environments. Excellent formability and weldability. Not recommended for chloride-rich or marine environments (use 316L). Used in food processing, kitchen equipment, architecture, tanks, and general engineering.
630 / 17-4PH
1.4542
Precipitation-hardening martensitic stainless steel — the highest-strength stainless in common use. Solution anneal at 1040°C then age at 480-620°C for UTS >1300 MPa. Corrosion resistance similar to 304. Cu+Nb precipitation hardening. Trade names include 17-4PH, SUS630. Used for aerospace structural parts, turbine blades, valve components, nuclear waste casks, medical instruments, and oil/gas equipment.
| 304 / X5CrNi18-10 | 630 / 17-4PH | |
|---|---|---|
| Material Number | 1.4301 | 1.4542 |
| Category | Stainless Steel | Stainless Steel |
| Standard | EN 10088-2 | EN 10088-3 |
Chemical composition (wt%)
| Element | 304 / X5CrNi18-10 | 630 / 17-4PH | Overlap |
|---|---|---|---|
| C | 0–0.07% | 0–0.07% | OK |
| Si | 0–1% | 0–0.7% | OK |
| Mn | 0–2% | 0–1.5% | OK |
| P | 0–0.045% | 0–0.04% | OK |
Mechanical properties
| Property | 304 / X5CrNi18-10 | 630 / 17-4PH | Unit |
|---|---|---|---|
| tensile_strength | 500–700 | ≥ 1310 | MPa |
| yield_strength | ≥ 190 | ≥ 1170 | MPa |
| elongation | ≥ 45 | ≥ 10 | % |
Compatibility Assessment
304 / X5CrNi18-10 and 630 / 17-4PH have moderate differences (62% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 304 / X5CrNi18-10 the same as 630 / 17-4PH?
304 / X5CrNi18-10 and 630 / 17-4PH have a 62% composition overlap. They are generally not directly interchangeable.
Can I replace 304 / X5CrNi18-10 with 630 / 17-4PH?
Generally not recommended. The compositions differ significantly (62% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between 304 / X5CrNi18-10 and 630 / 17-4PH?
The main differences are in the following elements: Cr, Ni. 304 / X5CrNi18-10 is a Stainless Steel grade, while 630 / 17-4PH is a Stainless Steel grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.